5. A vernier callipers has its main scale graduated in mm and 10 divisions on its vernier scale are equal in length to 9 mm. When the two jaws are in contact, the zero of vernier scale is ahead of zero of main scale and 3rd division of vernier scale coincides with a main scale division. Find : (i) the least count and (ii) the zero eror of the vernier callipers.
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Verified answer
Answer:
A vernier calliper has its main scale graduated in mm and 10 divisions on its vernier scale are equal in length to 9mm.
LC = 10 - 9 = 0.1 mm = 0.01cm.
LC = 0.01cm
zero error = 3 × 0.01cm.
= 0.03cm.
zero error = 0.03cm.
Answer:
Value of one main scale division is 1 mm
10 div of vernier scale =9 mm.
1 div of vernier scale =9/10 mm.
Least count =L.C.= Value of one main scale division – Value of one vernier scale division
L.C= 1−
10
9
=1 mm−0.9 mm=0.1 mm=0.01 cm
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